Amalthea

Amalthea is an inner irregular satellite of Jupiter, measuring 250 km across and is noted for its red color.
Amalthea was discovered by Edward Emerson Barnard on 9 September 1892, named after a nymph in Greek mythology.

Discovery E. E. Barnard, 9 September 1892
Primary body Jupiter
Periapsis 181150 km
Apoapsis 182840 km
Mean orbit radius 181365.84 km
Eccentricity 0.00319
Orbital period 11h57m23s (0.49817943d)
Average orbital speed 26.57 km/s
Inclination 0.374° (to Jupiter's equator)
PHYSICAL CHARACTERISTICS
Dimensions 250×146×128 km
Mean radius 83.5 km
Volume 2.43×10⁶ km³
Mass 2.08×10¹⁸ kg
Mean density 0.857 g/cm³
Surface gravity 0.02 m/s²
Escape velocity 0.058 km/s
Rotation period synchronous
Axial tilt zero
Albedo 0.09
Mean surface temperature 120°K
Apparent magnitude from Earth 14.1

Jupiter's natural satellites

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Numbered Satellites: S/2003 J2 | S/2003 J4 | S/2003 J9 | S/2003 J10 | S/2003 J12 | S/2003 J16 | S/2003 J18 | S/2003 J19 | S/2003 J23 | S/2003 J 24 |S/2010 J1 | S/2010 J2 | S/2011 J1 | S/2011 J2 S/2011 J3 | S/2016 J1 | S/2016 J3 | S/2016 J4 | S/2017 J1 | S/2017 J2 | S/2017 J3 | S/2017 J5 | S/2017 J6 | S/2017 J7 | S/2017 J8 | S/2017 J9 | S/2018 J2 |S/2018 J3 | S/2018 J4 | S/2021 J1 S/2021 J2 | S/2021 J3 | S/2021 J4 | S/2021 J5 | S/2021 J6 | S/2022 J1 | S/2022 J2 | S/2022 J3

Amalthea

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